I've found a solution, here's the result (ambiant 25C - after 1h warm-up) :
- 50C @ internal regulator (18C lower)
- 40C @ hottest analog front-end channel (6C to 11C lower)
- 34C @ LA connector (22C lower)
- 34C @ hottest BNC connector (4C to 5C lower)
- The noise level is correct (same level as Siglent SDM3055)
Simple description (pictures come later) for this first modification "MSO5000_cooling_mod_a"
- You need to remove the metal protection panel
- Replace the original Sunon fan with a
Noctua NF-A9 5V and mount with output airflow upside
- Create an airduct adapter to convert the original 80mm hole and screw holes to the new 92mm Noctua fan (height does not exceed 8mm)
- Pick the 5V on red wire from power supply and ground from hearth screw to the new Noctua fan (warning !!! 5V only !)
- Attach another
Noctua NF-A12x15 FLX fan to the back-panel (airflow will come in), it will be over the power-supply
- Make a converter from the original Rigol 2-pin fan connector to a classical 3-pin fan connector and connect the new 120mm Noctua fan (after checking the ground to earth and +V to the green wire)
- Install the specific skirt (I'll post pictures and schematic later)
Pro :
- Not necessary to remove original metal fan-frame and the 4 rivets
- Temperatures are far below from the original design
Cons :
- Need to open the unit and remove the internal metal protection panel
- Noise is a little higher
- Need to buy 2 fans (Noctua NF-A9 5V and Noctua NF-A12x15 FLX)
- Need to create a 80 to 92mm airduct adapter with a small height (8mm)
- Attaching the 120mm fan to the back side of the box could be complicated
Airduct adapter 80 to 92mm fan using cardboard
Airduct schematic using 80-300g/m2 paper (.1mm = 1pixel)
airduct-92mm-paper-cut.png (19.98 kB. 2000x2000 - viewed 322 times.)
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![EEVblog #1146 - New Low Cost Rigol MSO5000 Oscilloscope](https://www.eevblog.com/forum/index.php?action=dlattach;topic=149959.0;attach=787296;image)
![EEVblog #1146 - New Low Cost Rigol MSO5000 Oscilloscope](https://www.eevblog.com/forum/index.php?action=dlattach;topic=149959.0;attach=787302;image)
![EEVblog #1146 - New Low Cost Rigol MSO5000 Oscilloscope](https://www.eevblog.com/forum/index.php?action=dlattach;topic=149959.0;attach=787308;image)